phase3: nullfix.py batch script — bang/late/param-nullable

Automated null-safety fixes driven by dart analyze (no corruption):
- unchecked_use_of_nullable_value: insert '!' on receiver (property/method/[]/op)
- not_initialized field/var: mark 'late'
- missing_default_value_for_parameter: nullable param
Errors: 2374(peak) -> 907

lib/widgets/mobile/mobile_view_ticket.dart

@@ -34,7 +34,7 @@ class MobileViewTicket extends StatefulWidget {
 class MobileViewTicketState extends State<MobileViewTicket> {
   final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
 
-  Ticket ticket;
+  late Ticket ticket;
 
   final issueMsgController = TextEditingController();
 
@@ -123,7 +123,7 @@ class MobileViewTicketState extends State<MobileViewTicket> {
           width: double.maxFinite,
           padding: EdgeInsets.only(top: 8.0, left: 16.0, right: 16.0, bottom: 24.0),
           child: Text(
-            '${ticket.issue.msg}',
+            '${ticket.issue!.msg}',
             style: TextStyle(
               color: Colors.black54,
               fontSize: 14.0,
@@ -141,7 +141,7 @@ class MobileViewTicketState extends State<MobileViewTicket> {
         Container(
           width: double.maxFinite,
           padding: EdgeInsets.only(top: 16.0, bottom: 16.0, left: 16.0, right: 16.0),
-          child: showGalleryImages(mainContext, ticket.issue.files),
+          child: showGalleryImages(mainContext, ticket.issue!.files),
           decoration: BoxDecoration(
             border: Border(
               bottom: BorderSide(
@@ -171,7 +171,7 @@ class MobileViewTicketState extends State<MobileViewTicket> {
       ],
     );
 
-    if (ticket.followUps.length > 0) {
+    if (ticket.followUps!.length > 0) {
       view.children.add(
         Container(
           width: double.maxFinite,
@@ -185,8 +185,8 @@ class MobileViewTicketState extends State<MobileViewTicket> {
           ),
         ),
       );
-      for (int i = 0; i < ticket.followUps.length; i++) {
-        FollowUp followUp = ticket.followUps[i];
+      for (int i = 0; i < ticket.followUps!.length; i++) {
+        FollowUp followUp = ticket.followUps![i];
         view.children.add(
           Container(
             width: double.maxFinite,
@@ -294,7 +294,7 @@ class MobileViewTicketState extends State<MobileViewTicket> {
               ),
               autofocus: false,
               validator: (String? value) {
-                if (value.trim().isEmpty) {
+                if (value!.trim().isEmpty) {
                   return S.of(context).this_field_is_required;
                 }
                 return null;
@@ -353,7 +353,7 @@ class MobileViewTicketState extends State<MobileViewTicket> {
       ),
     );
 
-    if (ticket.followUps.length > 0) {
+    if (ticket.followUps!.length > 0) {
       view.children.add(
         Container(
           width: double.maxFinite,
@@ -393,7 +393,7 @@ class MobileViewTicketState extends State<MobileViewTicket> {
             padding: EdgeInsets.only(left: 20.0, right: 20.0, top: 0.0, bottom: 30.0),
             child: TextLink(
               S.of(context).new_ticket,
-              '/new-ticket/${ticket.store.id}',
+              '/new-ticket/${ticket.store!.id}',
             ),
           ),
       );
@@ -690,7 +690,7 @@ class MobileViewTicketState extends State<MobileViewTicket> {
                       child: Text(S.of(context).ok),
                       onPressed: () {
                         Routes.router.navigateTo(context,
-                          '/my-support/${ticket.store.id}',
+                          '/my-support/${ticket.store!.id}',
                           replace: true,
                         );
                       },